BU4939G-TR

Supervisors Overview

The BU4939G-TR is a CMOS voltage detector manufactured by ROHM Semiconductor, designed for monitoring power supply voltages in electronic systems. It operates within a supply voltage range of 0.7 V to 7 V and features a fixed detection threshold of 3.9 V with an overvoltage threshold of 3.939 V. The device offers high accuracy of ±1% and consumes a typical static current of 500 nA. It utilizes an SSOP-5 package and supports operation temperatures from -40°C to +125°C.

Supervisors Feature Summary

• CMOS output structure for low power consumption
• High precision voltage detection with ±1% accuracy
• Wide operating temperature range suitable for industrial applications

Supervisors Applications

• Microprocessor power supply monitoring
• Portable battery-powered equipment
• Test and measurement instruments

Supervisors Procurement Notes

Verify the specific suffix and package type against official datasheets to ensure compatibility. Confirm lifecycle status as Not Recommended for New Designs (NRND) before finalizing procurement plans. Check RoHS compliance details through authorized channels.

Supervisors Selection Notes

Select this component when a fixed 3.9 V threshold is required for system supervision. Consider the CMOS output type and low standby current for energy-efficient designs. Ensure the SSOP-5 footprint fits the target PCB layout constraints.

Supervisors Part Context

This part belongs to the BU49xx series of supervisory circuits from ROHM. These devices are engineered for reliable voltage monitoring in portable and industrial electronics. The series provides various threshold options to accommodate different logic levels and power rails.

Supervisors Replacement Considerations

The BD5209G-1 is listed as a replacement option with similar pinout and package characteristics. Verify functional differences such as output type and current specifications before substitution.